ABSTRACT
A cross sectional study was conducted to determine the dynamic prevalence of bovine tuberculosis amongst bovine using single intra dermal cervical comparable test (SICCT or CIDT) in North-Eastern agro-climatic zone of Tamil Nadu. In the present study, Out of 1119 blood samples tested from four selected districts of North-Eastern agro-climatic zone of Tamil Nadu, the overall prevalence of M. bovis infection in North-Eastern agro-climatic zones of Tamil Nadu was found to be 8.46 per cent by CIDT and highest prevalence was noticed in Vellore (10.86%) district followed by Kancheepuram (8.20%), Thiruvallur (7.92%) and Chennai (6.86%) districts, which shows the potential to increase the incidence as well as prevalence of the disease since the “test and slaughter” or “culling policy” are yet to be strengthened intensively or warranting the calf-hood immunization against tuberculosis
ABSTRACT
Bovine tuberculosis (bTB), caused primarily by Mycobacterium bovis, continues to exert an economic loss, even in countries with active control measures, and is one of zoonotic diseases enable to be transmitted to human. The control and eradication of bTB are mainly based on a test and slaughter policy and/or abattoir surveillance. Various factors including limitation of diagnostic tests have been considered as major constraints to eradication. Single intradermal test (SIT) is the official diagnostic test. New diagnostic methods are needed to be developed, because of limitations of the test. In the present study SIT was compared with single intradermal comparative cervical test (SICCT) and interferon (IFN)-gamma assay. There was very low correlation between SIT and SICCT. However, high correlation was shown between SIT and IFN-gamma assay while no correlation was observed between SICCT and IFN-gamma assay. Therefore, our results suggest the possibility of replacement of SIT with IFN-gamma assay for the diagnosis of bovine tuberculosis.